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The PDF bookmarks are generated by matching the titles from the topics in the content. The built-in CSS rules are in: [PLUGIN_DIR]/css/p-bookmarks.css.

*[class~="topic/topic"] > *[class~="topic/title"] {
  bookmark-label:content(before) content(text);  
  -ah-bookmark-label:content(before) content();
}
	
*[class~="topic/topic"] > *[class~="topic/title"] {
  prince-bookmark-level: 1;
  -ah-bookmark-level: 1;
  bookmark-level: 1;  
}
*[class~="topic/topic"] *[class~="topic/topic"] > *[class~="topic/title"] {
  prince-bookmark-level: 2;
  -ah-bookmark-level: 2;
  bookmark-level: 2;
}
*[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] > *[class~="topic/title"] {
  prince-bookmark-level: 3;
  -ah-bookmark-level: 3;
  bookmark-level: 3;
}
*[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] > *[class~="topic/title"] {
  prince-bookmark-level: 4;
  -ah-bookmark-level: 4;
  bookmark-level: 4;
}
*[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] > *[class~="topic/title"] {
  prince-bookmark-level: 5;
  -ah-bookmark-level: 5;
  bookmark-level: 5;

}
*[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] > *[class~="topic/title"] {
  prince-bookmark-level: 6;
  -ah-bookmark-level: 6;
  bookmark-level: 6;

}
*[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] *[class~="topic/topic"] > *[class~="topic/title"] {
  prince-bookmark-level: 7;
  -ah-bookmark-level: 7;
  bookmark-level: 7;

}
Note: This is listed solely for illustration purposes, as the plugin might use something different.